Changes RpnExpr.mutate argument order

python_rpnexpr.c

@@ -40,7 +40,7 @@ static PyMethodDef RPNExpr_methods[] = {
 			"Evaluate an expression"),
 	PYRPN_method("mutate", rpnexpr_mutate,
 			METH_VARARGS | METH_KEYWORDS,
-			"self, params=None, n_mutations=1",
+			"self, n_mutations=1, params=None",
 			"Mutate an expression"),
 	PYRPN_method("reset_stack", rpnexpr_reset_stack,
 			METH_NOARGS,
@@ -548,15 +548,15 @@ PyObject* rpnexpr_mutate(PyObject* slf, PyObject *args, PyObject *kwds)
 {
 	PyRPNExpr_t *self = (PyRPNExpr_t*)slf;
 
-	char *str_args = "|OI:RPNIterExpr.mutate";
-	char *names[] = {"params", "n_mutations", NULL};
+	char *str_args = "|IO:RPNIterExpr.mutate";
+	char *names[] = {"n_mutations", "params", NULL};
 
 	PyObject *py_params = NULL;
 	unsigned int n_mutations = 1;
 	rpn_mutation_params_t params;
 
 	if(!PyArg_ParseTupleAndKeywords(args, kwds, str_args, names,
-				&py_params, &n_mutations))
+				&n_mutations, &py_params))
 	{
 		return NULL;
 	}

tests/tests_rpn_mutate.py

@@ -85,7 +85,7 @@ class TestRpnExprMutation(unittest.TestCase):
         expt_len = int(expt_len*n_mut)
 
         expr = pyrpn.RPNExpr("", 3)
-        expr.mutate(params, n_mutations=n_mut)
+        expr.mutate(n_mut, params)
         msg = "Expected a len of %d ( [%d..%d] with %.1f%% error) but got %d"
         self.assertTrue(abs(len(expr) - expt_len) <= n_mut*percent_error,
                 msg=msg % (expt_len,